Attachment for photographic cameras



2 Sheets-Sheet 1.

(No Model.)

P. L. SENAT.

ATTACHMENT POR PHOTOGRAPHIC CAMERAS No. 367,013.

3141) fn/Lic@ 1 Patented July 19, 1887.

SLV-M411@ was @waa/f Patented July 19, 1887.

ATTACHMENT FOR PHOTOGRAPHIG CAMERAS. N0. 367,013.

@mi [wm om@ ALM @mlm NNN IIIIIlllllilllllillllllll UNITED STATES PATENT OFFICEo PROSPER L. SENAT, OF PHILADELPHIA, PENNSYLVANIA.

ATTACHMENT FOR PHOTOGRAPHIC CAMERAS.

SPECIFICATION forming part'of Letters Patent No. 367,013, dated July' 19, 1887.

Application filed May 9, 1887. Serial No. 237,580. (No model.)

.To @ZZ whom, it may concern:

Be it known that I, PnosPER L. SENAT, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improved Attachments for Photographic Cameras, of which the following is a specication. y

.'Ihe object of my invention is to so yconstruct and apply an attachment to a photographic camera that a portion only of the sensitive plate may be exposed, so that'the plate can have two or more pictures formed upon it, as desired.

In the accompanying drawings, Figure 1 is aperspecti-ve view of a camera with' my attachment, the latter being so applied as to expose but one-half of the plate. Fig. 2 is sectional plan view of Fig. 1 with the plate-holder in position. Fig. 3 is a view of the attachment in itsv simplest form. Fig. 4 is a perspective view oi' a blocking-out plate to be secured to the attachment. Fig. 5 is a sec-A tional perspective view of the rear portion of the cam-era, showing my attachment with blocking-cnt plate applied thereto. Fig. 6 is a sectional plan view of the camera, showing the use of two attachments. Figs. 7, 8, 9, and 10 are views showing minor details of construction; and Figs. 1l, 12, and 13 are diagrams illustrating the action of the blockingout plate -used with the attachment.

In using photographic cameras it is often desirable to make independent pictures on different parts of a single plate, or to limit the area of plate exposed for other purposes; and it has been hitherto proposed to provide a camera with pivoted internal shutters having spindles which project through the box, and by which the shutters can be swung to and fro. This not only necessitates a special camera for the purpose, but is quite an expensive contrivance, and the variations in the character of the exposure are limited. My improved attachment, on the contrary, is simple and inexpensive, and such that it can be readily applied to any ordinary camera and adj usted so as to expose any desired fraction of the plate.

Referring to Figs. 1 and 2, A is the camerabox; b', the front frame of the same; a, the beliows-extension; b, the rear frame; B, the

ground-glass frame; D, a plate-holder of the usual form, and d the platea portion of which is to be exposed.

In that form of the attachment shown in Figs. 1 and 2, E is a stiff strip, of metal,wood, pasteboard, or other available material, extending from top to bottom of the camera and adapted to grooves e in the top and bottom of the back frame, b. I have shown in the present instance five grooves, e, for effecting the division of the box into halves, quarters, and thirds, and I have also shown grooves, g, at

the side of the box for the reception of a transverse attachment.

To the strip E, I hinge a wing, F, which extends into the camera, as shown in Fig. 2. This wing is hinged iu any suitable manner; but I prefer to use a strip of fabric, as shown, the fabric being such as will prevent the access of light to the portion of the box that is shut oft' by the wing.

Around the wing F is a Hap, f, of fabric, also impervious to light, the purpose of this iiap being to cut off any rays ot' light that might otherwise pass around the edges of the wine.

I Liinake the strip E somewhat larger than is required for the size of camera for which the attachment is intended, as shown by dotted lines in Fig. 3, so that the purchaser can cut away the surplus portion until the strip fits the box, as cameras often vary slightly in the size of the opening.

In some instances a weight, h, may be used uponthe free end of the wing F, said.v weight being secured permanently to the wing, as shown in Fig. 7, or detachably secured thereto, as shown in Fig. 3, in which the weight is represented as fitted in a suitable pocket, h'. This weight is for the purpose of causing the shifting ofthe wing from one side ofthe camera to the other by simply tipping the camera to one side without removing the plate-holder.r

In Fig. 6 I have shown two attachments, one cutting off a portion of each side of the camera so as to expose the central portion of the plate, after which either of the wings may be thrown over, as shown by dotted lines, for instance, so as to expose either ot the end portions of the plate.

rlhe attachment described provides for di- IOO viding the plate into sections vertically. To divide the plate horizontally,I use the attachment illustrated in Fig. 4, which is simply a plate, G, having a spring-catcli, j, whereby it is applied to the strip E, the portion on one side of said catch being equal in area to onequarter of the sensitive plate d, the portion t" on the other side equaling one sixth of said plate d in area.

To .'expose one-quarter of the plate d, I apply the strip E to the central grooves, e, ol' the box, so as to divide the camera into halves, the wing F protecting onehalf the plate, and the portion fz? of the plate G one-half of the exposed portion of the saine, tlms leaving but one-quarter exposed, as shown by lines in Fig. Il.

If the operator wishes to make six different exposures ou the plate, the strip is adjusted so that twothirds ot the plate will be protected by the wing F and one-sixth of the plate by the portion z" ot" the plate G, leaving the remaining onesixtli of the plate to be cxposed, as shown in the diagram, Fig. 12.

In exposing the center ol` the plate the wing F is caused to protect one-third of the plate, the slide of theplate-holder protecting the opposite third, and the central portion being partially covered by the portion t' ol" the plate G, as shown in Fig. 13. i

The attachment may, it" desired, be made as shown in Fig. 7, the strip E having a squared lower portion, m, and a pin, m', at then upper end, and being made slightly less in height than the opening in the frame b of the camera.

The opening fo r the pin m is slightly deeper than the length of thepiii, so that by fully iiiserting the pin and then dropping the portion m into its socket the attachment will be rigidly held in place.

In Fig. S I have sliowu an attachment pro vided with signing-lingers n at top and bottoni, the device in this case being, if desired, made. in one piece-that is to say, the spring lingers being connected directly to the wing F and the strip Il being dispensed with, the lingers permitting any desired lateral or angular`adjustmeiit ot` the wing and also preventing the accidental longitudinal displace nient ot' the attachment.

The wing may, il desired, have a spring iinger at top or bottom only, a pin being pro vided on the other edge, as shown in Fig. 9, for instance. In this case also I have shown the wing with a flap, j, on the rear edge, this iiap bearing against the plate l and being used, mainly, for long exposures.

In Fig. 10 I have shown an attachment made of a llexible piece of card-board, having sccured to it two small pins, s, so that by slightly bending the card-board the attachment can be inserted in the camera, the pins engaging with the top and bottom of the frame b and holding the attachment firm enough for the purpose required.

I have found by experiment that in ease of short exposures the attachment need not bear against the sensitive plate in ordento exclude the light from the protected portion of said plate, the narrow space between the protector and the plate, as shown in Fig. 2, having no bad effect so long as the direct rays ot light from the lens are cnt off. It, however, the attachment does not extend to or almost to the rear end of t-lie box, light is liable to gain access to the protected portion of the plate and blur and fog the picture formed or to be formed thereon.

In some cases the attachment may be secured directly to the platcliolder, the pivotApin being at the end ofthe wing F, as shown by dot ted lines in Fig. 10.

I claim as my inyentioir l l. Anattaehment forphotographiccameras, consisting of awing constructed forapplication to and removal from an ordinary eaiiicia and extending into the box, so as to eut oi the light from a portion of the plate to be exposed, substantially as described.

2. The combination, in an attachment for photographic cameras, of a strip constructed for application to the rear of the box,and h aving pivoted .thereto a wing adapted to swing from side to side of the box, substantially as described.

3. An attachment for photographie cameras, consisting of a wing, F, projecting into the box, and having a flexible ilap around said projecting portion of the same, all substantially as described.

' 4. An attachment for photographie cameras, consisting of a pivoted wing for protecting a portion of the plate to be exposed, said wing being weighted so that on tilting the box the wing is caused to swing from one side of the saine to the other, all substantially as and for the purpose set forth.

5. rlhe combination ot a camera-box with a cutting-oft' attachment consisting of a wing extending into the box, and means whereby said attachment can be adjusted and retained laterally in different positions in the opening at. the rear ot' the box, all substantially as specified.

G. The combination of a camera-box having in the frame recesses dividing the opening into quarters and thirds, with an attachment having a portion adapted to these recesses, and a wing extending into the camera, substantially as described.

7. The combination of an attacliiiieiit`extending into a camera-box and protecting a portion of the plate, with a blocking-ont plate adapted to be secured to the attachment and to cover a portion of the plate not protected by the latter, all substantially as described.

S. The combination of theproteeting attachnient with a blocking-out plate having a dcvice for securing it to said attachment, the portions ofthe plate on opposite sides ot' said securing device being of dit't'erent size, all sub` stantially as specified.

9. The combination ofa camera-box with a removable protecting-wing projecting into said ICC IKO

box, and a springlnger carried by Said Wing I In testimony whereof Ihave signed my name and bearing at top or bottom against the frame to this speoicaton in the presence of two sub- 1o of the box, all substantially as specified. Scribing Witnesses.

l0. The combination of a camera-box with a 5 .removableplate-protectingattachment consist- RROSPER' L' SENAT' ing of a wing projecting into the box and hav- Titnessesz ing at the rear edge a flexible ap for bearing WILLIAM D. CONNER,

upon the plate, all substantially as speoied. HENRY HOWSON. 

